similar to: replacement in a dataframe

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Hi, I'm trying to read data from a PDF file.Is it possible to do it with R? Thanks, Marco [[alternative HTML version deleted]]

Hello, If I have a dataframe: example(data.frame) zz<-c("aa_bb","bb_cc","cc_dd","dd_ee","ee_ff","ff_gg","gg_hh","ii_jj","jj_kk","kk_ll") ddd <- cbind(dd, group = zz) and I want to divide the column named group by the "_", how would I do this? so instead of the first row being x

Hi, I have a problem: I need to perform a very tough analysis, so I would like to buy a new computer with about 16 GB of RAM. Is it possible to use all this memory under Windows or have I to install other OS? Thanks, Marco

Dear all I've got stuck when trying to replace values in a vector by selecting replacements from a replacement table. I'm trying to use only base functions. Here's a dummy example: > (x <- rep(letters,2)) [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l"

Hi, I have an index "i" that varies from 1 to n. For each value of this index I open a connection, e.g. conness<-url(...) conness<-readLines(conness) For certain values of "i" it occurs an error (Warning message: cannot open: HTTP status was `0 (null)' ) and the program flow ends. How can I ignore these errors, allowing the program to go on? Thanks,

Hi all, probably really simple to solve, but having no background in programming I haven't been able to figure this out: I have two dataframes like df1 <- data.frame(names1=c('aa','ab', 'ac', 'ad'), var1=c(1,5,7,12)) df2 <- data.frame(names2=c('aa', 'ab', 'ac', 'ad', 'ae'), var2=c(3,6,9,12,15)) Now I want merge

Hola R-adictos, me gustaría que alguien me ayudara a aplicar la función "quantile" (varios percentiles) a un marco de datos estratificado por algunas variables categóricas (ver fichero adjunto como ejemplo). La idea es obtener varios percentiles de varias variables (primeras columnas del fichero de datos), pero dividiendo el marco de datos en función de los valores de las variables

How do a plot several columns of a matrix at once in a single plot versus a single x-variable? The default plot.matrix or plot.dataframe commands plot each column versus each other column in several sub-plots. I want to plot each column versus a single other vector (x) as several lines or points in one plot. I can do it by hand: get the range of all variables (i.e. columns of the matrix or

Dear R-experts, I have got a dataframe: data ID disease V1 V2 1 p1 1 2 p1 3 3 p3 3 4 p3 5 5 p5 1 From which I extract a usefull table: affect affect 1 3 5 p1 1 1 0 p3 0 1 1 p5 1 0 0 I want to merge this with anotherdataframe: age p1 23 p2 24 p3 23 p4 11 p5 45 If have tried as.data.frame(affect) and other solutions to get the following comment going:

I have the following sample dataset (CSV input here:http://goo.gl/YR8LP. CSV output here: http://goo.gl/EFCC8) which I want to transform as follows. For each person in a household I want to create two new variables OrigTAZ and DestTAZ. It should take the value in TripendTAZ and put that in DestTAZ. For OrigTAZ it should put value of TripendTAZ from the previous row. For the first trip of every

To whom it may concern I made some analysis with R using the command Anova. However, I found some problmes with the output obtained by selecting type II o type III sum of squares. Briefly, I have to do a 2x3 mixed model anova, wherein the first factor is a between factor and the second factor is a within factor. I use the command Anova in the list below, because I want to obtain also the sum

Hi everyone, A beguinner question. - How shall i import 9 different ascii (created from a gis layer (arcmap grid)) into R to create a single dataframe for using in hier.part? Should i use read.table, then turn each created object into a single vector using unlist and finally use data.frame to joint all the vectors into a unique data frame (xcan in the usage of hier.part) ? I´ve been trying to

Hello All, sample() only sample on one variable x. But I'm interested in sampling more than one variable without replacement. Suppose I have 3 vectors x, y, z. I want to draw samples from all three vectors such that the combination of the three elements in each draw is not the same as any previous draws. I could use expand.grid to generate a vector out of the three vectors. But when the

Today, I was looking for an elegant (and efficient) way to get a named (atomic) vector by selecting one column of a data frame. Of course, the vector names must be the rownames of the data frame. Ok, here is the quiz, I know one quite "cute"/"slick" answer, but was wondering if there are obvious better ones, and also if this should not become more idiomatic (hence

I am having a series of problems using date time data that has been converted into a POSIXt and POSIXlt classes. I have hourly time series data from 1900 that has been converted from text data. I assume most of my problems come from a mis-underdanding of the POSIX class. My matrix named (aa) for this year is approx 8700 by 4. When I try to calculate the length of posit column ( which is the

Full_Name: Aart Overeem Version: 2.2.0 OS: Linux Submission from: (NULL) (145.23.254.155) Construct a dataframe consisting of several variables by using 'data.frame' and 'cbind' and write it to a file with 'write.table'. The file consists of headers and values, such as 12.4283675334551 (so 13 numbers behind the decimal point). If this dataframe is read with

Dear R Masters, I'm an anesthesiology resident trying to make his way through basic statistics. Recently I have been confronted with longitudinal data in a treatment vs. control analysis. My dataframe is in the form of: subj | group | baseline | time | outcome (long) or subj | group | baseline | time1 |...| time6 | (wide) The measured variable is a continuous one. The null hypothesis in

Hi there, I am doing some network analysis working with k-cliques and over time I want to see what nodes are members of what cliques and how big these cliques are. I have managed to produce a matrix which shows which k-cliques each node is part of over the 100 time periods (slow though) but I cannot seem to calculate the size of each k-clique which is actually just a count. Basically I have a

Hi everybody, I have a large dataframe similar to this one: knames <-c('ab', 'aa', 'ac', 'ad', 'ab', 'ac', 'aa', 'ad','ae', 'af') kdate <- as.Date( c('20111001', '20111102', '20101001', '20100315', '20101201', '20110105', '20101001', '20110504',